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[BAEL-8456] - Moved more articles into 'java-dates' module

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This commit is contained in:
amit2103
2018-08-26 00:49:30 +05:30
parent 3bd1ed4ece
commit c5e1d6f0ef
23 changed files with 10 additions and 11 deletions
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core-java-8/README.md
-6
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@@ -18,7 +18,6 @@
- [Finding Max/Min of a List or Collection](http://www.baeldung.com/java-collection-min-max)
- [Java Base64 Encoding and Decoding](http://www.baeldung.com/java-base64-encode-and-decode)
- [The Difference Between map() and flatMap()](http://www.baeldung.com/java-difference-map-and-flatmap)
- [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
- [Copy a File with Java](http://www.baeldung.com/java-copy-file)
- [Static and Default Methods in Interfaces in Java](http://www.baeldung.com/java-static-default-methods)
- [Efficient Word Frequency Calculator in Java](http://www.baeldung.com/java-word-frequency)
@@ -30,15 +29,10 @@
- [Finding Min/Max in an Array with Java](http://www.baeldung.com/java-array-min-max)
- [Internationalization and Localization in Java 8](http://www.baeldung.com/java-8-localization)
- [How to Find an Element in a List with Java](http://www.baeldung.com/find-list-element-java)
- [Measure Elapsed Time in Java](http://www.baeldung.com/java-measure-elapsed-time)
- [Java Optional – orElse() vs orElseGet()](http://www.baeldung.com/java-optional-or-else-vs-or-else-get)
- [An Introduction to Java.util.Hashtable Class](http://www.baeldung.com/java-hash-table)
- [Method Parameter Reflection in Java](http://www.baeldung.com/java-parameter-reflection)
- [Java 8 Unsigned Arithmetic Support](http://www.baeldung.com/java-unsigned-arithmetic)
- [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
- [Generalized Target-Type Inference in Java](http://www.baeldung.com/java-generalized-target-type-inference)
- [Calculate Age in Java](http://www.baeldung.com/java-get-age)
- [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
- [Increment Date in Java](http://www.baeldung.com/java-increment-date)
- [Add Hours To a Date In Java](http://www.baeldung.com/java-add-hours-date)
- [Overriding System Time for Testing in Java](http://www.baeldung.com/java-override-system-time)
core-java-8/src/main/java/com/baeldung/datetime/modify/DateIncrementer.java
-63
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@@ -1,63 +0,0 @@
package com.baeldung.datetime.modify;
import org.apache.commons.lang3.time.DateUtils;
import org.joda.time.DateTime;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.util.Calendar;
import java.util.Date;
import java.util.logging.Logger;
public class DateIncrementer {
private static final Logger log = Logger.getLogger(DateIncrementer.class.getName());
private static final int INCREMENT_BY_IN_DAYS = 1;
public static String addOneDay(String date) {
return LocalDate
.parse(date)
.plusDays(INCREMENT_BY_IN_DAYS)
.toString();
}
public static String addOneDayJodaTime(String date) {
DateTime dateTime = new DateTime(date);
return dateTime
.plusDays(INCREMENT_BY_IN_DAYS)
.toString("yyyy-MM-dd");
}
public static String addOneDayCalendar(String date) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
c.setTime(sdf.parse(date));
c.add(Calendar.DATE, 1);
return sdf.format(c.getTime());
}
public static String addOneDayApacheCommons(String date) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date incrementedDate = DateUtils.addDays(sdf.parse(date), 1);
return sdf.format(incrementedDate);
}
public static void main(String[] args) throws ParseException {
String date = LocalDate
.now()
.toString();
log.info("Current date = " + date);
String incrementedDateJava8 = DateIncrementer.addOneDay(date);
log.info("Date incremented by one day using (Java 8): " + incrementedDateJava8);
String incrementedDateJodaTime = DateIncrementer.addOneDayJodaTime(date);
log.info("Date incremented by one day using (Joda-Time): " + incrementedDateJodaTime);
String incrementedDateCalendar = addOneDayCalendar(date);
log.info("Date incremented by one day using (java.util.Calendar): " + incrementedDateCalendar);
String incrementedDateApacheCommons = addOneDayApacheCommons(date);
log.info("Date incremented by one day using (Apache Commons DateUtils): " + incrementedDateApacheCommons);
}
}
core-java-8/src/main/java/com/baeldung/timezonedisplay/TimezoneDisplay.java
-55
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@@ -1,55 +0,0 @@
package com.baeldung.timezonedisplay;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
public class TimezoneDisplay {
public enum OffsetBase {
GMT, UTC
}
public List<String> getTimeZoneList(OffsetBase base) {
Set<String> availableZoneIds = ZoneId.getAvailableZoneIds();
LocalDateTime now = LocalDateTime.now();
return availableZoneIds
.stream()
.map(ZoneId::of)
.sorted(new ZoneComparator())
.map(id -> String.format("(%s%s) %s", base, getOffset(now, id), id.getId()))
.collect(Collectors.toList());
}
private String getOffset(LocalDateTime dateTime, ZoneId id) {
return dateTime
.atZone(id)
.getOffset()
.getId()
.replace("Z", "+00:00");
}
private class ZoneComparator implements Comparator<ZoneId> {
@Override
public int compare(ZoneId zoneId1, ZoneId zoneId2) {
LocalDateTime now = LocalDateTime.now();
ZoneOffset offset1 = now
.atZone(zoneId1)
.getOffset();
ZoneOffset offset2 = now
.atZone(zoneId2)
.getOffset();
return offset1.compareTo(offset2);
}
}
}
core-java-8/src/main/java/com/baeldung/timezonedisplay/TimezoneDisplayApp.java
-18
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@@ -1,18 +0,0 @@
package com.baeldung.timezonedisplay;
import java.util.List;
public class TimezoneDisplayApp {
public static void main(String... args) {
TimezoneDisplay display = new TimezoneDisplay();
System.out.println("Time zones in UTC:");
List<String> utc = display.getTimeZoneList(TimezoneDisplay.OffsetBase.UTC);
utc.forEach(System.out::println);
System.out.println("Time zones in GMT:");
List<String> gmt = display.getTimeZoneList(TimezoneDisplay.OffsetBase.GMT);
gmt.forEach(System.out::println);
}
}
core-java-8/src/test/java/com/baeldung/datetime/modify/DateIncrementerUnitTest.java
-34
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@@ -1,34 +0,0 @@
package com.baeldung.datetime.modify;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class DateIncrementerUnitTest {
private final static String DATE_TO_INCREMENT = "2018-07-03";
private final static String EXPECTED_DATE = "2018-07-04";
@Test
public void givenDate_whenUsingJava8_thenAddOneDay() throws Exception {
String incrementedDate = DateIncrementer.addOneDay(DATE_TO_INCREMENT);
assertEquals(EXPECTED_DATE, incrementedDate);
}
@Test
public void givenDate_whenUsingJodaTime_thenAddOneDay() throws Exception {
String incrementedDate = DateIncrementer.addOneDayJodaTime(DATE_TO_INCREMENT);
assertEquals(EXPECTED_DATE, incrementedDate);
}
@Test
public void givenDate_whenUsingCalendar_thenAddOneDay() throws Exception {
String incrementedDate = DateIncrementer.addOneDayCalendar(DATE_TO_INCREMENT);
assertEquals(EXPECTED_DATE, incrementedDate);
}
@Test
public void givenDate_whenUsingApacheCommons_thenAddOneDay() throws Exception {
String incrementedDate = DateIncrementer.addOneDayApacheCommons(DATE_TO_INCREMENT);
assertEquals(EXPECTED_DATE, incrementedDate);
}
}
core-java-8/src/test/java/com/baeldung/time/ElapsedTimeUnitTest.java
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@@ -1,76 +0,0 @@
package com.baeldung.time;
import static org.junit.Assert.assertEquals;
import java.time.Duration;
import java.time.Instant;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang3.time.StopWatch;
import org.junit.Test;
public class ElapsedTimeUnitTest {
@Test
public void givenRunningTask_whenMeasuringTimeWithCurrentTimeMillis_thenGetElapsedTime() throws InterruptedException {
long start = System.currentTimeMillis();
simulateRunningTask();
long finish = System.currentTimeMillis();
long timeElapsed = finish - start;
assertEquals(true, (2000L <= timeElapsed) && (timeElapsed <= 3000L));
}
@Test
public void giveRunningTask_whenMeasuringTimeWithNanoTime_thenGetElapsedTime() throws InterruptedException {
long start = System.nanoTime();
simulateRunningTask();
long finish = System.nanoTime();
long timeElapsed = finish - start;
assertEquals(true, (2000000000L <= timeElapsed) && (timeElapsed <= 3000000000L));
}
@Test
public void givenRunningTask_whenMeasuringTimeWithStopWatch_thenGetElapsedTime() throws InterruptedException {
StopWatch watch = new StopWatch();
watch.start();
simulateRunningTask();
watch.stop();
long timeElapsed = watch.getTime();
assertEquals(true, (2000L <= timeElapsed) && (timeElapsed <= 3000L));
}
@Test
public void givenRunningTask_whenMeasuringTimeWithInstantClass_thenGetElapsedTime() throws InterruptedException {
Instant start = Instant.now();
simulateRunningTask();
Instant finish = Instant.now();
long timeElapsed = Duration.between(start, finish).toMillis();
assertEquals(true, (2000L <= timeElapsed) && (timeElapsed <= 3000L));
}
/**
* Simulate task running for 2.5 seconds.
*
* @throws InterruptedException
*/
private static void simulateRunningTask() throws InterruptedException {
TimeUnit.MILLISECONDS.sleep(2500); // 2.5 seconds
}
}